Cross-wire for optical measuring instruments.



'PATENTED JUNE 2', 1903.

. K. HEIN. GROSS WIREAFQRQPTI-GAL MEASURING INSTRUMENTS.

APPLICATION FILED MAR. 17, 1902.

' 4 SHEETS-SHEET 1.

"No MODEL.

v No. 730,016. PAIBNTED JUNE 2, 1903.

YK.HEYIN.

GROSS WIRE FOR OPTICAL MEASURING INSTRUMENTS.

' APPLICATION FILED MAR. 17, 1902.

N0 MODEL- 4 SHEETS-SHEET-Z.

. m: fiiTok a/zrw No. 730,016. PATENTED JUNE 2, 1903.

v T HEIN; c gsswIRTmR OPTICAL MEASURING INSTRUMENTS.

' APPLIOATION'FILED MAB.1'(,1902.

no MODEL. l 4 SHEETS-SHEET mum/70 W/TA/EWLYEJ 4 awe/many K- HBIN- Y GROSS WIRE FOR OPTICAL MEASURING INSTRUMENTS.

APPLIOA TION FILED MAR. 17, 19.02

PATBNTED JUNE 2, 1903. f

I I0 MODEL. 4 SHEETS-SHEET 4.

UNITED STATES Patented-June 2, 1903.

PAT NT OFFICE.

KA IQH'E'IN; OF HA OVER, GERMANY? SPECIFICATION forming part of Letters Patent No. 730,016, dated June 2, 1903. Application filed Mmh 17,1902. Serial m. 98,643. (No morleLl To all whom it may concern Be it known that I, KARL HEIN, a subject of the King of Prussia, Emperor of Germany, and a resident of Hanover, infthe German Empire, have invented an Improved Gross-Wire for Optical Measuring Instruments, of which the following is a specification.

The object of my invention is to simplify and improve the construction of the crosswire, cross-hair, or fiber-cross devices, as they are variously termed, of optical measuring instruments and the like.

In this specification I will for convenience refer to the device under the term crosswire.

In the accompanying drawings, Figures 1 and 1 are face and edge views, respectively, of one form in which my invention maybe carried into effect. Figs. 2 and 2 are similar views of amodification. Figs. 3 to 10, inelusive, are views of other modifications.

One of the principal features of my invention consists in providing the cross-wire carrier with guides whereby a single thread may be wound in such a manner that it crosses itself within the carrier.

I use the'term thread in this specification in a general sense and as'including any suitable material, such as fiber, wire, or hair.

I11 Figs. 1 and 2 I have: represented the cross-wire frame or carrier a as a circular ring, on one face of which 1 provide two thread-guides b c and dc opposite each other, Fig. 1, and with the ends of these guides diametrically opposite each other and in two planes perpendicular to each other, so that upon winding a single thread 00 around these diametrically'o 'iposite guides the, lines of the thread will cross each other in'the center of the ring space, so as to form the desired cross-wire out of a single thread, as illustrated in Fig. 1.

The modification illustrated in Figs. 2 and 2 is identical with that illustrated in Figs. 1 and 1, except that the ring frame or carrier is shown as of rectangular form instead of the circular shape shown in Fig. 1.

In the modification Fig. 3 one guide of the ring-carrier a is formed of three lugs or blocks 17 0 cl, while the other diametrically opposite guide is formed of three similar lugs or blocks e f g;

I11 the modification illustratedin Fig. 4 a ring-carrier is shown as of rectangular outline and one guide is formed of three pins 1) c d and the other guide is formed of three like pins e f 9 In these two cases the single 1 thread 00 is carried around the guides, as in' Figs. l and2, seas to form two lines crossing each other in the center of the ring-space.

In Fig. 5 the carrier A is shown as provided with three guides, two of them 19 c and e f being on one side of the ring, while the third guide (Z is a short piece on the opposite side of the ring, so that the single thread is carried once perpendicularly and twice horizontally across the ring-space.

I have illustrated a similar construction in Fig. 6, except that there the guides 19 c, d 6 and f g are'distributed so as to permit of the single wire as being carried once perpendicularly and three times horizontally across.

the ring-space.

The guides for the threads need notconsist of separate or interrupted parts as so far de- In connection with the described feature of my invention I may provide means for applying tension to the thread, so that it may:

be kept taut at all times. Thus in Figs. 7 and 7 A I have shown a peg it, somewhat like the 1 tightening-peg of a stringed musical instru- I ment, the peg being frictionally setinto an opening 76' in the peg 70.

In Figs. 9, 9* I have illustrated the peg 1; as carrying a coiled spring with a hooked end engaging the loop of thread .11, so as to keep the thread under constant tension.

In the modification, Figs. 10 and 10, a helical spring j, secured at its lower end by a screw m to the carrier a and connected at its upper end to the loop of thread at, will keep the latter taut.

I claim as my invention 1. A cross-wire device for optical 1neasuring instruments, consisting of a ring having guides and a single thread wound over the guides and crossing itself within the ringspace.

2. A cross-wire device for optical measuring instruments, consisting of a ring having two diametrically opposite guides with the two ends of each guide standing in planes 

